#include<iostream>
using namespace std;
int main(){
short n;
while(cin>>n){
if(n%3==0) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
}

#include<iostream>
using namespace std;
int main(){
short n;
while(cin>>n){
if(n%3==0) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
}

哈哈會na